The C# Trill Key

The C# trill key is an optional mechanism that enables the use of extra trills and alternate fingerings on the Flute. It is widely available on custom and upper Flute models and is also an option on some intermediate models. The C# Trill Key mechanism includes an extra tone hole and key cup situated next to the thumb key, and is operated by the C# Trill key lever or spatula that is usually placed next to the Bb lever. (Diagram courtesy of Miyazawa Flutes)

Partial List of C# Trill Options:
First and second octave B to C# trill - Finger B and depress the C# trill.
First and second octave C to C# trill - Finger C and depress the C# trill.High G to Ab trill - Finger High G and depress the C# trill
High G to A trill - Finger high G and trill the C# trill key and D trill key at the same time.
High Ab to Bb trill - Finger high Ab and trill the C# trill key, the D trill key and the D# trill key in unison.High F# to G# - Finger high F# and depress the C# trill

Tremolo uses include:
First octave - tremolo to C# from G, Ab, A, Bb, B or C by depressing the C# trill.
Second octave - tremolo to C# from A, Bb, B or C by depressing the C# trill.
First octave - tremolo to D from G, Ab, A, Bb or B by trilling the C# trill and the D trill at the same time.
First octave, tremolo to D# from G, Ab, A, Bb or B by trilling the C# trill and the D# trill at the same time.

Another famous use of the key was inspired by Claude Debussy's "Prelude to the Afternoon of the Faun," wherin the flutist fingers B and depresses the C# for more control and color on the opening C#.